The analysis process is as follows:

Let their perimeters be 16 cm.

① Rectangular: assuming that the length is 5cm and the width is (16-2×5)÷2=3 (cm), then S = 5× 3 =15 (cm2);

② Square: If the side length is 16÷4=4 (cm), then S = 4× 4 =16 (cm2);

S is positive > s is long.

Extended data

Square area formula:

Square area = side length × side length, that is, s = a× a = the square of a.

Characteristics of the cube:

1. A cube has eight vertices, and each vertex is connected by three edges.

2. A cube has 12 sides, and each side has the same length.

A cube has six faces, and each face has the same area.

Area formula of rectangle:

Area = length × width

Characteristics of cuboids

1, a cuboid has six faces. The reverse sides of each group are exactly the same.

2. A cuboid has 12 sides, and four opposite sides are equal in length. According to the length, it can be divided into three groups, each group has four sides.

3. A cuboid has eight vertices. Each vertex connects three edges. The three edges of a cuboid are called length, width and height.

4. Two adjacent sides of a cuboid are perpendicular to each other.